SAT Question be35c117: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

Choice A is correct. Dividing the number of revolutions by the number of minutes gives the number of revolutions the turbine completes per minute. It's given that the wind turbine completes $900$ revolutions in $50$ minutes. Therefore, at this rate, this turbine completes $\frac{900}{50}$, or $18$, revolutions per minute.